Liquid Penetrant Inspection (LPI) Level 1 Practice Test

These questions are part of the practice quiz. Start practicing

• During a penetrant test, which of the following health precautions should not be used?
• What safety concern is associated with looking into a black light during penetrant inspection?
• Which statement concerning liquid penetrant testing is correct?
• When penetrant testing parts, the temperature of the parts should be near room temperature. If the part is at a low temperature when tested, the penetrant may become viscous.
• Why is a filter used over a black light bulb in fluorescent penetrant testing?
• When performing a penetrant test using a post-emulsification penetrant, which factor is most critical with respect to proper training?
• Which statement is true about the effect of part temperature on penetrant testing?
• The problem with retesting a test specimen that has been previously tested using liquid penetrant is that
• Which discontinuity is most readily detected by liquid penetrant inspection?
• Which of the following statements does not apply to developers used during penetrant testing?
• Before applying penetrant, the surface must be free of which contaminants to prevent false indications?
• Which material is not suitable for liquid penetrant testing?
• In water-washable penetrant testing, when is the wet developer applied relative to penetrant removal?
• A good penetrant must do all of the following except?
• For wet developer, which layer thickness is better for showing very fine cracks?
• If a part previously tested with visible dye penetrant is reprocessed with fluorescent penetrant, what is the likely effect on fluorescence?
• Which statement about the effect of temperature on liquid penetrant performance is true?
• A penetrant inspection cannot detect which of the following?
• What is the primary limitation of liquid penetrant testing?
• The method used to remove excess visible dye penetrant from a test specimen is primarily determined by which factor?
• Which discontinuities is most likely to be missed due to improper rinse techniques?
• Which statement about applying a standard temperature penetrant to a hot specimen is true?
• The contamination of a water-washable penetrant with an excessive amount of water will
• Which action is likely to result in a loss of sensitivity in the liquid penetrant examination?
• Which of the following statements is true about the dryer usage in penetrant testing?
• What could happen if a person looks directly into a black light?
• Which surface condition is explicitly mentioned as potentially detrimental to liquid penetrant testing?
• Which of the following is a common method of penetrant removal?
• Which statement about submersion in penetrant testing is true?
• The most widely accepted method for removing excessive water-washable penetrant from the surface of a test specimen is by
• When using fluorescent penetrant, the inspection must be performed in which environment?
• Why is a penetrant having a high flash point desirable?
• Under ordinary lighting conditions, which penetrant can be used?
• Visible dye penetrants reveal defects as which color combination under white light?
• Which of the following is generally accepted as the most important precaution when using water-washable penetrants?
• Which statement about visible dye penetrants is true?
• Which of the following is the most commonly used method for removing nonwater-washable visible dye penetrant from the surface of a test specimen?
• What is a common method for removing excess penetrant when using solvent-removable penetrants?
• Cutting oils may be effectively removed from parts before penetrant testing by
• If improperly used, developers
• Which factors determine how long a part must be kept wet with penetrant before the removal process is started?
• When using a post-emulsifiable penetrant, the emulsifier time should be
• Color-contrast penetrants variations are commercially available in which of the following groupings?
• Which factors affect the resolution of penetrant indications?
• All of the following parts can be tested by the liquid penetrant method except:
• In a liquid penetrant test using a post-emulsifiable visible dye penetrant, the wet developer is generally applied by which method?
• What hazard is associated with using a UV lamp for penetrant testing if the filter is compromised?
• Subsurface discontinuities can be best detected by which of the following?
• A generally accepted method for removing excess nonwater-washable penetrant is:
• All of the following materials can be effectively tested with liquid penetrant except which material?
• Which of the following is not a generally accepted method for applying penetrants?
• In liquid penetrant inspection, what role does the developer play to aid the visibility of indications?
• Oil on the surface should be removed prior to penetrant testing.
• When classifying penetrants by the method used to remove excess penetrant, which of the following is a proper classification?
• Excess penetrant (all penetrant except that which is in discontinuities) is removed from the specimen
• Which of the following could be a source of false indications on a test specimen?
• The purpose for using a developer on a test specimen is to
• On very smooth surfaces, which developer type is recommended when using fluorescent penetrant?
• Which of the following is an incorrect use of crack panels (blocks)?
• What is the most universally used black light?
• Which phase in penetrant examinations requires the greatest skill and experience?
• If the filter is not used over a black light, which problem is likely to occur?
• Which of the following is not a property of a developer used in liquid penetrant testing?
• Which safety precaution does not apply when handling penetrant materials?
• Which lighting is required to cause fluorescent penetrant to glow in a fluorescent penetrant test?
• Which statement about removing excess penetrant is true?
• Which term describes the time allowed for penetrant to enter discontinuities?
• Black light equipment is required when penetrant testing by
• Which mechanism causes penetrant to enter a discontinuity?
• Which preparation is required before applying penetrant to a painted surface?
• Why is cleaning the part prior to penetrant inspection essential?
• Which center wavelength is most desirable for the output of the light source used in fluorescent processes?
• Which of the following is a critical parameter to monitor when using post-emulsification penetrants?
• Which of the following are commonly accepted methods for applying penetrant?
• When using the post-emulsification fluorescent process, which method cannot be used?
• During a post-emulsifiable visible penetrant test, how is the wet developer typically applied?
• A desirable property of a good penetrant is which of the following?
• In liquid penetrant testing, which function is NOT performed by the developer?
• When using dry developer, the drying operation is performed
• The term used to define the tendency of certain liquids to penetrate into small openings such as cracks or fissures is
• The terms 'dry,' 'aqueous wet,' and 'nonaqueous wet' are used to describe three different types of
• Which of the following characteristics does not apply to liquid penetrant testing?
• Which of the following can be removed from the surface of a test specimen by vapor degreasing?
• Which statement best describes the capability of liquid penetrant testing?
• The time period from developer application to inspection is referred to as the development time.
• Which choice correctly states the center wavelength of the fluorescent light used to excite penetrants?
• Which statement is not a basic principle of penetrant inspection?
• What is the purpose of an emulsifier in penetrant testing?
• What term describes the material that mixes with the penetrant and enables removal by washing?
• Which light is used to view fluorescent penetrants?
• Which of the following is not a standard component of the liquid penetrant inspection process?
• The first step in conducting a liquid penetrant test on a painted surface is to
• Liquid penetrant testing is capable of detecting
• When a penetrant is applied to a part by submerging the part in a penetrant bath, the part must
• Which of the following conditions will decrease the life of a black light bulb?
• Which of the following is a disadvantage of the liquid penetrant testing method?
• Which statement about the post-emulsification fluorescent process is true?
• Which factor is NOT listed as affecting resolution in penetrant indications?
• Liquid penetrants become sluggish and lose sensitivity at temperatures
• Which term describes the action of the developer that creates the maximum bleed-out of penetrant?
• Which condition will affect the rate and extent a liquid penetrant will enter cracks, fissures, and other small openings?
• Which method assures adequate rinsing when using fluorescent water-washable penetrant?
• Which statement is false about penetrant testing?
• Which could be a source of false indications on a test specimen?
• The most common type of contaminant in fluorescent penetrant fluid is
• Which type of penetrant requires an emulsification step?
• What is the preferred method for pre-cleaning parts prior to penetrant testing?
• Liquid penetrant testing can be used to detect:
• Cleaning of the part prior to penetrant inspection is essential because surface contaminants may prevent penetrant from gaining access to discontinuities.
• All of the following methods are commonly used to clean parts prior to penetrant testing except:
• The term used to define the period of time in which the test part is covered with penetrant is
• What condition can cause cracking of the developer coating during the drying operation?
• Using a black light lamp with a cracked filter or without the filter in place can cause damage because the lamp emits
• The penetrant applied to the surface of a test specimen is drawn into discontinuities by:
• Insufficient rinsing of fluorescent penetrants will result in
• A solvent used to clean the surface of a test specimen must possess all of the following characteristics except that the cleaner must not be flammable.
• In liquid penetrant testing, which step follows penetrant dwell time to reveal indications?
• The failure to completely remove acid materials from a part before fluorescent penetrant is applied will result in
• Penetrants may be classified or subdivided by the method used to remove excess penetrant. Which of the following is a proper classification in accordance with this statement?
• Liquid penetrant examination can detect all of the following types of discontinuities except
• The term used to describe the action of a developer soaking up penetrant to maximize bleed-out is
• When working in a darkened area, how long is the generally accepted time to become adjusted to the dark before inspecting parts?
• Crack panels are used to evaluate the sensitivity of the penetrant inspection process.
• Which type of penetrant is described as post-emulsifiable and yields a visible indication?
• Usually, the most desirable method of removing excess water-washable penetrant after the dwell time is by using
• Which is generally the more acceptable method for cleaning parts prior to penetrant testing?
• Which of the following is generally accepted as the most important precaution when using solvent-removable penetrants?
• What is the penetration time in penetrant testing?
• When using solvent-removable penetrants, the excess penetrant may be removed by
• Which surface contaminant cannot be removed by cleaning parts in a vapor degreaser?
• When applying penetrant by dipping, heating the penetrant prior to dipping is:
• In dry developer usage, the drying occurs immediately after removal of excess penetrant, before the inspection step. Which step follows the drying?
• Which penetrant system is generally the least sensitive?
• What is the most common contaminant found in fluorescent penetrant fluid?
• Why is it possible to flush a surface with a coarse water spray to which a water-washable penetrant was applied, remove the excessive penetrant, and not remove the penetrant that is in the defects?
• All of the following materials can be tested by the usual liquid penetrant tests except:
• What is the observable indication when using fluorescent penetrants under UV light?
• Which effect is associated with heating a penetrant beyond recommended temperatures before application?
• Penetrant is applied to a part by dipping. The part is then placed on a rack while the penetrant seeps into discontinuities. If the penetration time is too long, it will be difficult to rinse the penetrant from the part. If this happens, the normal rinsing properties can be restored by
• What is one purpose of the filter used with a black light in penetrant inspection?
• In wet development, using a thicker layer of developer will
• Before conducting a liquid penetrant test, the surface of the part must be free of which substances?
• Visible penetrant may be applied by which methods?
• Which statement best describes the relationship between surface roughness and the penetrant removal method?
• Which surface condition could have a detrimental effect on a liquid penetrant test?
• Which process would be most sensitive to detecting very fine defects?
• In a fluorescent penetrant test, a commonly used technique for assuring that the excess penetrant has been removed prior to the application of a developer is to
• Which of the following is NOT an accepted method for applying penetrant?
• What does the term post-emulsifiable indicate about the penetrant inspection process?
• Liquid penetrant testing is best suited to detect discontinuities that are:
• In a water-washable liquid penetrant test, the wet developer is applied
• Penetrants may be classified or subdivided by the method used to remove excess penetrant. Which of the following is a proper classification for this statement?
• Which material is not suitable for liquid penetrant testing?
• Which of the following is a commonly used classification for penetrant?
• In post-emulsification penetrant testing, the emulsifier should be applied
• Black light, with a proper functioning filter in place, used for fluorescent penetrant inspection can cause permanent damage to
• In liquid penetrant inspection, when should the inspection of a test specimen for discontinuities occur?
• When drying parts during a penetrant test, the parts
• Which type of discontinuity can be detected by the penetrant test method?
• Bleed-out of penetrant from a cold shut is an example of
• Color-contrast penetrants are commercially available in which variations?
• Which is the most likely result of an excessive emulsification time when using post-emulsification penetrants?
• Which conditions can lead to cracking of the developer coating during drying?
• Which of the following statements is true regarding the drying stage in penetrant testing?
• Which of the following penetrant methods does not require a source of electricity?
• Which of the following is an acceptable method for applying wet developers?
• A red against white background discontinuity image is most likely to be seen when which penetrants are used?
• In post-emulsification methods, emulsifier application occurs after the penetrant has dwelled for a period. Which option reflects this timing?
• Which combination of methods is commonly used to apply penetrant?
• If a part to be penetrant tested is first heated to a high temperature, the penetrant
• Which of the following statements is true about the three described developer types?
• Which statement best states the danger of sandblasting (without subsequent chemical etching) for cleaning surfaces to be penetrant tested?
• Which component provides a contrasting background to reveal indications in liquid penetrant inspection?
• In fluorescent penetrant testing, what lighting condition is essential to observe indications?
• Fluorescent penetrants are typically viewed under which condition?
• Before applying fluorescent penetrant, what pre-cleaning step is essential?
• For a very smooth surface using fluorescent penetrant, which type of developer is preferred?
• Which is an advantage of visible dye penetrants over fluorescent penetrants?
• The rate and extent of penetrant entry into cracks is influenced by the surface condition.